To provide a toner for developing an electrostatic charge image, that can realize low-temperature fixing with a wide fixing temperature range and is excellent in fixing strength and that presents little soiling such as filming onto a photoreceptor and is free from soiling in the interior of the apparatus due to deterioration in the electrostatic property. The vanes are biased outwardly and forced inwardly by a cam action of the interior wall of the housing of the piston. In addition, the methods include determining a characteristic of the data set, and encoding the data set.